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I have had good results with Aces IV.

Using data logging, I am seeing equivalent performance with 93 octane untreated vs 89 treated with Aces IV.

LT KR (always 0) and ST KR (occasional max 3 degree momentary blip at WOT) readings are remarkably similar.

Another benefit is that Aces IV claims to have detergent and upper cylinder lubricating properties.
 
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